Improvement in cutter-head



tlcted tate @sind @wie Letters Patent No. 93,628, dated August l0, 1869.

IMPRQVEMENT IN' CUTTER-HEAD.

The Schedule referred to in these Letters Patent and making part of the same.

To all' whom t't may concern Be it known that I, MICHAEL LEHMAN, of Cincinnati, Ohio, have invented an Improvementin Planing- Machines; and Ihereby declare that the following is a clear, full, aud'exact description of the, same, reference being had to the accompanying drawings, in Which- Figure 1 is a perspective view of a cutter-head with my improvement attached thereto;

Figure 2 is a top view of the same with the cap removed; and

Figure 3 is a vertical sectional View throughthe line :v-x.

The objects of my invention, are: to reduce the labor necessary in grinding and sharpening the bits or knives, as at present constructed; to avoid the great loss of time involved in the process of sharpening; and to effect a saving in the costly material used in the construction of the bits.

These bits require a great deal of grinding, which Ainvolves a loss oftime and the expenditure of' much hard labor; and while the process of grinding the bits is going on, the machine itself is necessarily idle. To enable others skilled in the art to make and use my invention, I will proceed to describe the manner in which I have carried it out.

The bits or knives B B are made from thin steel plates, and are secured between the block A and the caps C C, by means of the bolts a a. These bits are of ne steel, whilethe caps C C may be manufactured of ordinary iron, thus eecting a great saving in the cost of material.` rlhe bits thus made can be readily upon the cutter-head, inside of the edges of the bits,

toprevent the bits from breaking, and to render the cutter-head more durable.

It is evident that the principle of my invention is applicable to ordinary planing-bits, as well as to chisels for working in wood or stone.

Claims.

What I claim as my invention, and desire to secure by Letters Patent, is

The cutter-head A, in combination with the bits B B, and caps C C,`and steel plates E E, constructed and arranged with reference' to each other, and for the purpose substantially as sety forth.

Also, the bits B B, in combination' with the adjusting-screws b b and caps C C, when the same are constructed substantially as and for the purpose described.

Also, the adjusting-screws b b and their plates e c, in 'combination with theV notches n n, when all the parts are constructed substantially as described.

MICHAEL LEHMAN.

Witnesses:

N. MARCHANT, J 01m T. Sonnen. 

